Bimetallic Ni‒Co phosphide nanosheets self-supported on nickel foam as high-performance electrocatalyst for hydrogen evolution reaction

Chen, Yu; Xu, Fei; Luo, Lin; Abbo, Hanna S.; Titinchi, Salam J.J.; Shen, Pei Kang; Tsiakaras, Panagiotis; Yin, Shibin

doi:10.1016/j.electacta.2019.05.150

Cited by 73 publications

(23 citation statements)

References 44 publications

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“…While the use of “pure water” is trivial for obtaining high-performance at a noble metal-free (Ni, Co, Fe, etc.) electrocatalysts [ 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 ], there is a growing concern about the water supply for H 2 electrolyzers [ 3 , 17 , 18 , 19 , 20 ]. It is argued that the access to this resource is already problematic and thus requiring large quantities of freshwater might become a concern if the water electrolysis technology is deployed more widely in the hot and arid regions that have very limited access to freshwater but significant access to seawater [ 19 , 20 , 21 ].…”

Section: Introductionmentioning

confidence: 99%

Insights on the Electrocatalytic Seawater Splitting at Heterogeneous Nickel-Cobalt Based Electrocatalysts Engineered from Oxidative Aniline Polymerization and Calcination

et al. 2021

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Given the limited access to freshwater compared to seawater, a growing interest surrounds the direct seawater electrolysis to produce hydrogen. However, we currently lack efficient electrocatalysts to selectively perform the oxygen evolution reaction (OER) over the oxidation of the chloride ions that are the main components of seawater. In this contribution, we report an engineering strategy to synthesize heterogeneous electrocatalysts by the simultaneous formation of separate chalcogenides of nickel (NiSx, x = 0, 2/3, 8/9, and 4/3) and cobalt (CoSx, x = 0 and 8/9) onto a carbon-nitrogen-sulfur nanostructured network. Specifically, the oxidative aniline polymerization in the presence of metallic cations was combined with the calcination to regulate the separate formation of various self-supported phases in order to target the multifunctional applicability as both hydrogen evolution reaction (HER) and OER in a simulated alkaline seawater. The OER’s metric current densities of 10 and 100 mA cm−2 were achieved at the bimetallic for only 1.60 and 1.63 VRHE, respectively. This high-performance was maintained in the electrolysis with a starting voltage of 1.6 V and satisfactory stability at 100 mA over 17 h. Our findings validate a high selectivity for OER of ~100%, which outperforms the previously reported data of 87–95%.

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Section: Introductionmentioning

confidence: 99%

Insights on the Electrocatalytic Seawater Splitting at Heterogeneous Nickel-Cobalt Based Electrocatalysts Engineered from Oxidative Aniline Polymerization and Calcination

et al. 2021

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“…Numerous studies have been devoted to enhancing the electrochemical properties of transition metal oxides/sulfides/phosphides/ carbides [10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28]. For example, Shen and Yin's research groups reported that the bimetallic nickel-cobalt phosphide shows improved HER activity and stability, due to its unique morphology with nanosheets on the 3D integrated framework, providing a large surface area and many active sites for HER [24]. In a recent works, among many HER catalyst candidates, two-dimensional MoS 2 , an earth-abundant material, with its unique layered structure and chemical properties, has shown attractive HER catalytic activity with the corresponding electrolyte ion adsorption and desorption energies [10,11].…”

Section: Introductionmentioning

confidence: 99%

Hierarchically Ordinated Two-Dimensional MoS2 Nanosheets on Three-Dimensional Reduced Graphene Oxide Aerogels as Highly Active and Stable Catalysts for Hydrogen Evolution Reaction

et al. 2021

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Hydrogen gas (H2) is being intensively proposed as a next-generation clean energy owing to the depletion of fossil fuels. Electrochemical water splitting is one of the most promising processes for hydrogen production. Furthermore, many efforts focusing on electrochemical water splitting have been made to develop low-cost, electrochemically active, and stable catalysts for efficient hydrogen production. MoS2 has emerged as an attractive material for developing catalysts for the hydrogen evolution reaction (HER). Hence, in this study, we design hierarchically ordinated two-dimensional (2D) MoS2 nanosheets on three-dimensional (3D) reduced graphene oxide (rGO) (H-2D/3D-MoS2-rGO) aerogel structures as a new class of electrocatalysts for the HER. We use the one-pot hydrothermal synthesis route for developing high-performance electroactive materials for the HER. The as-prepared H-2D/3D-MoS2-rGO contains a unique 3D hierarchical structure providing large surface areas owing to the 3D porous networks of rGO and more active sites owing to the many edge sites in the MoS2 nanosheets. In addition, the H-2D/3D-MoS2-rGO structure exhibits remarkable electrochemical properties during the HER. It shows a lower overpotential than pure MoS2 and excellent electrochemical stability owing to the large number of active sites (highly exposed edge sites) and high electrical conductivity from the rGO structure.

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“…Chen Yu et al. fabricated bimetallic Ni−Co phosphide nanosheets self‐supported on nickel foam for HER in an alkaline medium, which required overpotentials of 85, 210 and 350 mV to deliver current densities of −10, −500 and −1500 mA cm −2 , respectively [21] . Zhiyuan Wang et al.…”

Section: Introductionmentioning

confidence: 99%

Layered Ni−Co−P Electrode Synthesized by CV Electrodeposition for Hydrogen Evolution at Large Currents

et al. 2021

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In recent years, the catalyst efficiency of hydrogen evolution reaction (HER) has been extensively studied. However, the stability of catalysts at high current densities is still a challenge. Herein, layered Ni−Co−P was electrodeposited on carbon fiber paper (CFP) via cyclic voltammetry (CV). This low‐cost electrode exhibits high efficiency and excellent durability for HER in 1 M KOH. To achieve current densities of 10, 100, 500, and 1000 mA cm−2, Ni−Co−P/CFP required overpotentials of 49, 95, 170, and 295 mV, respectively. The layered structure allows the catalyst to fall off layer by layer. After the outer layer of catalyst falls off, the inner layer of catalyst will be exposed to continue working. After 300 h of HER at 1000 mA cm−2, Ni−Co−P/CFP still has a regular morphology and high efficiency. Our work shows that layered Ni−Co−P/CFP has excellent prospects for practical applications.

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Bimetallic Ni‒Co phosphide nanosheets self-supported on nickel foam as high-performance electrocatalyst for hydrogen evolution reaction

Cited by 73 publications

References 44 publications

Insights on the Electrocatalytic Seawater Splitting at Heterogeneous Nickel-Cobalt Based Electrocatalysts Engineered from Oxidative Aniline Polymerization and Calcination

Insights on the Electrocatalytic Seawater Splitting at Heterogeneous Nickel-Cobalt Based Electrocatalysts Engineered from Oxidative Aniline Polymerization and Calcination

Hierarchically Ordinated Two-Dimensional MoS2 Nanosheets on Three-Dimensional Reduced Graphene Oxide Aerogels as Highly Active and Stable Catalysts for Hydrogen Evolution Reaction

Layered Ni−Co−P Electrode Synthesized by CV Electrodeposition for Hydrogen Evolution at Large Currents

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